Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d7f16bcc595087…

MALICIOUS

PDF

69.7 KB Created: 2021-01-09 11:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 101aed2adccc15212d76b5d93c78052a SHA-1: 8f0dd9ad399578ce15acf2c4d2e3056575108354 SHA-256: f8d7f16bcc595087b501bc7e76cb93070c00f7d66e18ea58159a2265c417e61d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a link farm, directing users to external resources. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting an attempt to lure users to malicious sites. ClamAV also detected this file as a phishing trojan, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?utm_term=blade+and+soul+dance+mods In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_5fb28309a8b08.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/nedolowesonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_5fdab7973c33c.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/LFRtyhe/racing_go_kart_parts.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/2950744.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/nuxajof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62f35a60bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5ff015b74ed30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/battery_health_check_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/62272867747.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/vozipudita.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/hey_now_london_grammar_sheet_music.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 5040 bytes
SHA-256: 077f6434ec7a4d4984fd9a34650335ddc864fd6b7ee60d51648eb07e01b8d39b
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 10708 bytes
SHA-256: c1bdcf431dbdb1c91b292ba82a92f4415449408772e671253167dbdf146349b6

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